{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T08:28:16Z","timestamp":1765268896420,"version":"build-2065373602"},"reference-count":54,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2023,3,21]],"date-time":"2023-03-21T00:00:00Z","timestamp":1679356800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"],"award-info":[{"award-number":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"],"award-info":[{"award-number":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Key Research and Development Program of Shaanxi Province","award":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"],"award-info":[{"award-number":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"]}]},{"name":"Shaanxi Province Funds for Distinguished Young Youths","award":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"],"award-info":[{"award-number":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"]}]},{"name":"Fundamental Research Funds for the Central Universities","award":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"],"award-info":[{"award-number":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"]}]},{"name":"Innovation Fund of Xidian University","award":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"],"award-info":[{"award-number":["2018YFB2202500","62171337","62101396","2017KW-ZD-12","S2020-JC-JQ0056"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The coupling and spatial variation of range and azimuth parameters is the biggest challenge for bistatic forward-looking SAR (BFSAR) imaging. In contrast with the monostatic SAR and translational invariant bistatic SAR (TI-BSAR), the range cell migration (RCM), and Doppler parameters of high-speed bistatic forward-looking SAR (HS-BFSAR) have two-dimensional spatial variation characteristics, which makes it difficult to obtain SAR images with satisfactory global focusing. Firstly, based on the configuration of the spaceborne illuminator and high-speed forward-looking receiving platform, the accurate range-Doppler domain expression of the echo signal is derived in this paper. Secondly, using this analytical expression, a range nonlinear chirp scaling (NLCS) is proposed to equalize the RCM and equivalent range frequency modulation (FM) rate so that they can be uniformly processed in the two-dimensional frequency domain. Next, in the azimuth processing, the proposed method decomposes the Doppler contribution of the transmitter and receiver, respectively. Then, an azimuth NLCS is used to eliminate the spatial variation of the azimuth FM rate. Finally, a range-dependent azimuth filter is constructed to achieve azimuth compression. Simulation results validate the efficiency and effectiveness of the proposed algorithm.<\/jats:p>","DOI":"10.3390\/rs15061699","type":"journal-article","created":{"date-parts":[[2023,3,22]],"date-time":"2023-03-22T06:00:01Z","timestamp":1679464801000},"page":"1699","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A Modified NLCS Algorithm for High-Speed Bistatic Forward-Looking SAR Focusing with Spaceborne Illuminator"],"prefix":"10.3390","volume":"15","author":[{"given":"Yuzhou","family":"Liu","sequence":"first","affiliation":[{"name":"National Key Laboratory of Radar Signal Processing, Xidian University, Xi\u2019an 710071, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6672-367X","authenticated-orcid":false,"given":"Yachao","family":"Li","sequence":"additional","affiliation":[{"name":"National Key Laboratory of Radar Signal Processing, Xidian University, Xi\u2019an 710071, China"}]},{"given":"Xuan","family":"Song","sequence":"additional","affiliation":[{"name":"National Key Laboratory of Radar Signal Processing, Xidian University, Xi\u2019an 710071, China"}]},{"given":"Xuanqi","family":"Wang","sequence":"additional","affiliation":[{"name":"National Key Laboratory of Radar Signal Processing, Xidian University, Xi\u2019an 710071, China"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,21]]},"reference":[{"key":"ref_1","first-page":"108","article-title":"Digital Processing of Synthetic Aperture Radar Data: Algorithms and Implementation","volume":"1","author":"Cumming","year":"2005","journal-title":"Artech House"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"14876","DOI":"10.3390\/rs71114876","article-title":"Mapping CORINE Land Cover from Sentinel-1A SAR and SRTM Digital Elevation Model Data Using Random Forests","volume":"7","author":"Balzter","year":"2015","journal-title":"Remote Sens."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Chaabani, C., Chini, M., Abdelfattah, R., Hostache, R., and Chokmani, K. (2018). Flood Mapping in a Complex Environment Using Bistatic TanDEM-X\/TerraSAR-X InSAR Coherence. Remote Sens., 10.","DOI":"10.3390\/rs10121873"},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Cruz, H., V\u00e9stias, M., Monteiro, J., Neto, H., and Duarte, R.P. (2022). A Review of Synthetic-Aperture Radar Image Formation Algorithms and Implementations: A Computational Perspective. Remote Sens., 14.","DOI":"10.3390\/rs14051258"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Elfadaly, A., Abouarab, M.A.R., El Shabrawy, R.R.M., Mostafa, W., Wilson, P., Morhange, C., Silverstein, J., and Lasaponara, R. (2019). Discovering Potential Settlement Areas around Archaeological Tells Using the Integration between Historic Topographic Maps, Optical, and Radar Data in the Northern Nile Delta, Egypt. Remote Sens., 11.","DOI":"10.3390\/rs11243039"},{"key":"ref_6","unstructured":"(2022, November 17). Nile River in Black and White, Available online: https:\/\/www.jpl.nasa.gov\/images\/pia16179-nile-river-in-black-and-white."},{"key":"ref_7","unstructured":"Curlander, J.C., and Mcdonough, R.N. (1991). Synthetic Aperture Radar: Systems and Signal Processing, Wiley."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"395","DOI":"10.1016\/j.sigpro.2009.07.005","article-title":"An Effective Focusing Approach for Azimuth Invariant Bistatic SAR Processing","volume":"90","author":"Hua","year":"2010","journal-title":"Signal Process."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Cardillo, G.P. (1990, January 7\u201311). On the Use of the Gradient to Determine Bistatic SAR Resolution. Proceedings of the International Symposium on Antennas and Propagation Society, Merging Technologies for the 90\u2019s, Dallas, TX, USA.","DOI":"10.1109\/APS.1990.115286"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Jin, Y.-Q., and Xu, F. (2013). Polarimetric Scattering and SAR Information Retrieval, Wiley.","DOI":"10.1002\/9781118188149"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1109\/MAES.2014.130141","article-title":"Passive Bistatic SAR Imaging\u2014Challenges and Limitations","volume":"29","author":"Maslikowski","year":"2014","journal-title":"IEEE Aerosp. Electron. Syst. Mag."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1109\/MGRS.2015.2437353","article-title":"Tandem-L: A Highly Innovative Bistatic SAR Mission for Global Observation of Dynamic Processes on the Earth\u2019s Surface","volume":"3","author":"Moreira","year":"2015","journal-title":"IEEE Geosci. Remote Sens. Mag."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Wang, R., and Deng, Y. (2018). Bistatic SAR System and Signal Processing Technology, Springer.","DOI":"10.1007\/978-981-10-3078-9"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"5236715","DOI":"10.1109\/TGRS.2022.3214188","article-title":"Bistatic SAR Point Spread Function Analysis for Close Proximity Geometries","volume":"60","author":"Summerfield","year":"2022","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_15","unstructured":"Wu, J., Yang, J., Huang, Y., Yang, H., and Wang, H. (October, January 30). Bistatic Forward-Looking SAR: Theory and Challenges. Proceedings of the Radar Conference, 2009 IEEE, Rome, Italy."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Walterscheid, I., Espeter, T., Klare, J., Brenner, A.R., and Ender, J.H.G. (2010, January 25\u201330). Potential and Limitations of Forward-Looking Bistatic SAR. Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Honolulu, HI, USA.","DOI":"10.1109\/IGARSS.2010.5653210"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1826","DOI":"10.1109\/TAES.2017.2674158","article-title":"Thorough Understanding Property of Bistatic Forward-Looking High-Speed Maneuvering Platform SAR","volume":"53","author":"Mei","year":"2017","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"6018","DOI":"10.1109\/TGRS.2019.2903878","article-title":"PFA for Bistatic Forward-Looking SAR Mounted on High-Speed Maneuvering Platforms","volume":"57","author":"Zhang","year":"2019","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_19","first-page":"1","article-title":"Focusing High-Maneuverability Bistatic Forward-Looking SAR Using Extended Azimuth Nonlinear Chirp Scaling Algorithm","volume":"60","author":"Song","year":"2022","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"765","DOI":"10.1109\/LGRS.2011.2108635","article-title":"Bistatic Forward-Looking SAR: Results of a Spaceborne\u2013Airborne Experiment","volume":"8","author":"Espeter","year":"2011","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"206","DOI":"10.1049\/el.2013.3978","article-title":"Focusing Forward-looking Bistatic SAR Data with Chirp Scaling","volume":"50","author":"Qi","year":"2014","journal-title":"Electron. Lett."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1502","DOI":"10.1109\/TGRS.2019.2943743","article-title":"A Frequency-Domain Imaging Algorithm for Translational Variant Bistatic Forward-Looking SAR","volume":"58","author":"Mei","year":"2020","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"17","DOI":"10.1109\/JSTARS.2022.3153824","article-title":"Focusing High Maneuvering Bistatic Forward-Looking SAR With Stationary Transmitter Using Extended Keystone Transform and Modified Frequency Nonlinear Chirp Scaling","volume":"15","author":"Ding","year":"2022","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"2080","DOI":"10.1109\/TGRS.2020.3004726","article-title":"Bistatic-Range-Doppler-Aperture Wavenumber Algorithm for Forward-Looking Spotlight SAR With Stationary Transmitter and Maneuvering Receiver","volume":"59","author":"Zhang","year":"2021","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_25","first-page":"1","article-title":"Focusing Translational-Variant Bistatic Forward-Looking SAR Data Using the Modified Omega-K Algorithm","volume":"8","author":"Li","year":"2021","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_26","first-page":"5225916","article-title":"A Novel CFFBP Algorithm With Noninterpolation Image Merging for Bistatic Forward-Looking SAR Focusing","volume":"60","author":"Li","year":"2022","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Sun, H., Sun, Z., Chen, T., Miao, Y., Wu, J., and Yang, J. (2022). An Efficient Backprojection Algorithm Based on Wavenumber-Domain Spectral Splicing for Monostatic and Bistatic SAR Configurations. Remote Sens., 14.","DOI":"10.3390\/rs14081885"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2031","DOI":"10.1109\/TGRS.2004.835295","article-title":"Models and Useful Relations for Bistatic SAR Processing","volume":"42","author":"Loffeld","year":"2004","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"93","DOI":"10.1109\/LGRS.2006.885862","article-title":"A Two-Dimensional Spectrum for Bistatic SAR Processing Using Series Reversion","volume":"4","author":"Neo","year":"2007","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"735","DOI":"10.1109\/LGRS.2008.2004506","article-title":"Some Reflections on Bistatic SAR of Forward-Looking Configuration","volume":"5","author":"Qiu","year":"2008","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"605","DOI":"10.1587\/transcom.E96.B.605","article-title":"A Frequency-Domain Imaging Algorithm for Translational Invariant Bistatic Forward-Looking SAR","volume":"E96.B","author":"Wu","year":"2013","journal-title":"IEICE Trans. Commun."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"927","DOI":"10.1049\/iet-rsn.2014.0499","article-title":"Focusing One-Stationary Bistatic Forward-Looking Synthetic Aperture Radar with Squint Minimisation Method","volume":"9","author":"Ma","year":"2015","journal-title":"IET Radar Sonar Navig."},{"key":"ref_33","first-page":"31","article-title":"Imaging Method for the Extended Scene of Missile-Borne Bistatic Forward-Looking SAR","volume":"3","author":"Meng","year":"2016","journal-title":"J. Xidian Univ."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Wu, J., Yang, J., Huang, Y., and Yang, H. (2011, January 23\u201327). Focusing Bistatic Forward-Looking SAR Using Chirp Scaling Algorithm. Proceedings of the 2011 IEEE RadarCon (RADAR), Kansas City, MI, USA.","DOI":"10.1109\/RADAR.2011.5960693"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"290","DOI":"10.1049\/iet-rsn.2019.0382","article-title":"Squint-minimised Chirp Scaling Algorithm for Bistatic Forward-looking SAR Imaging","volume":"14","author":"Zhang","year":"2020","journal-title":"IET Radar Sonar Navig."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2481","DOI":"10.1109\/TGRS.2008.919018","article-title":"A Comparison of Point Target Spectra Derived for Bistatic SAR Processing","volume":"46","author":"Neo","year":"2008","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_37","unstructured":"Pu, W., Li., W., Lv, Y., and Wang, Z. (2015, January 10\u201315). An Extended Omega-K Algorithm with Integrated Motion Compensation for Bistatic Forward-Looking SAR. Proceedings of the 2015 IEEE Radar Conference (RadarCon), Arlington, VA, USA."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"4500","DOI":"10.1109\/JSTARS.2018.2873645","article-title":"Bistatic Forward-Looking SAR Focusing Using \u03c9-k Based on Spectrum Modeling and Optimization","volume":"11","author":"Wu","year":"2018","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"946","DOI":"10.1109\/36.921412","article-title":"New Applications of Nonlinear Chirp Scaling in SAR Data Processing","volume":"39","author":"Wong","year":"2001","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"2493","DOI":"10.1109\/TGRS.2008.917599","article-title":"Focusing Bistatic SAR Data Using the Nonlinear Chirp Scaling Algorithm","volume":"46","author":"Wong","year":"2008","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"3179","DOI":"10.1109\/TGRS.2008.921569","article-title":"An Improved NLCS Algorithm With Capability Analysis for One-Stationary BiSAR","volume":"46","author":"Qiu","year":"2008","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"3108","DOI":"10.1109\/TGRS.2012.2219057","article-title":"A Modified Nonlinear Chirp Scaling Algorithm for Spaceborne\/Stationary Bistatic SAR Based on Series Reversion","volume":"51","author":"Zeng","year":"2013","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_43","doi-asserted-by":"crossref","unstructured":"Wu, J., Sun, Z., Li, Z., Huang, Y., Yang, J., and Liu, Z. (2016). Focusing Translational Variant Bistatic Forward-Looking SAR Using Keystone Transform and Extended Nonlinear Chirp Scaling. Remote Sens., 8.","DOI":"10.3390\/rs8100840"},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Li, Z., Wu, J., Sun, Z., Huang, Y., Yang, H., and Yang, J. (2017, January 23\u201328). An Adaptive NLCS Technique for Large-Size Moving Target Imaging with Bistatic Forward-Looking SAR. Proceedings of the 2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Fort Worth, TX, USA.","DOI":"10.1109\/IGARSS.2017.8127467"},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Wu, J., Huang, Y., Yang, J., Li, W., and Yang, H. (2011, January 24\u201329). First Result of Bistatic Forward-Looking SAR with Stationary Transmitter. Proceedings of the 2011 IEEE International Geoscience and Remote Sensing Symposium, Vancouver, BC, Canada.","DOI":"10.1109\/IGARSS.2011.6049419"},{"key":"ref_46","doi-asserted-by":"crossref","unstructured":"Yang, J., Huang, Y., Yang, H., Wu, J., Li, W., Li, Z., and Yang, X. (2013, January 21\u201326). A First Experiment of Airborne Bistatic Forward-Looking SAR-Preliminary Results. Proceedings of the 2013 IEEE International Geoscience and Remote Sensing Symposium-IGARSS, Melbourne, Australia.","DOI":"10.1109\/IGARSS.2013.6723760"},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Zhang, Q., Wu, J., Yang, J., Huang, Y., Yang, H., and Yang, X. (2018, January 22\u201327). Non-Stop-and-Go Echo Model for Hypersonic-Vehicle-Borne Bistatic Forward-Looking Sar. Proceedings of the IGARSS 2018-2018 IEEE International Geoscience and Remote Sensing Symposium, Valencia, Spain.","DOI":"10.1109\/IGARSS.2018.8517465"},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Xi, Z., Duan, C., Zuo, W., Li, C., Huo, T., Li, D., and Wen, H. (2022). Focus Improvement of Spaceborne-Missile Bistatic SAR Data Using the Modified NLCS Algorithm Based on the Method of Series Reversion. Remote Sens., 14.","DOI":"10.3390\/rs14225770"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"781","DOI":"10.1109\/TGRS.2009.2029984","article-title":"Bistatic TerraSAR-X\/F-SAR Spaceborne\u2013Airborne SAR Experiment: Description, Data Processing, and Results","volume":"48","author":"Baumgartner","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Hong, F., Wang, R., Zhang, Z., Lu, P., and Balz, T. (2016). Integrated Time and Phase Synchronization Strategy for a Multichannel Spaceborne-Stationary Bistatic SAR System. Remote Sens., 8.","DOI":"10.3390\/rs8080628"},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Fu, J., Xing, M., and Sun, G. (2021). Time-Frequency Reversion-Based Spectrum Analysis Method and Its Applications in Radar Imaging. Remote Sens., 13.","DOI":"10.3390\/rs13040600"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"4160","DOI":"10.1109\/TGRS.2019.2961562","article-title":"Focusing of Bistatic SAR With Curved Trajectory Based on Extended Azimuth Nonlinear Chirp Scaling","volume":"58","author":"Wang","year":"2020","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Li, C., Zhang, H., and Deng, Y. (2021). Focus Improvement of Airborne High-Squint Bistatic SAR Data Using Modified Azimuth NLCS Algorithm Based on Lagrange Inversion Theorem. Remote Sens., 13.","DOI":"10.3390\/rs13101916"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"183692","DOI":"10.1109\/ACCESS.2019.2959326","article-title":"Image Local Features Description Through Polynomial Approximation","volume":"7","author":"Fawad","year":"2019","journal-title":"IEEE Access"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/6\/1699\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T19:00:05Z","timestamp":1760122805000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/6\/1699"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,3,21]]},"references-count":54,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2023,3]]}},"alternative-id":["rs15061699"],"URL":"https:\/\/doi.org\/10.3390\/rs15061699","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2023,3,21]]}}}